高强钢组合K形偏心支撑钢框架抗震性能非线性有限元分析*
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（1 长安大学建筑工程学院， 西安 710061； 2 西安建筑科技大学土木工程学院， 西安 710055；3 中国电力科学研究院， 北京 100055； 4 中国建筑标准设计研究院有限公司， 北京 100048）
［摘要］高强钢组合偏心支撑钢框架是耗能梁段采用屈服点较低的钢材、钢框架采用高强钢的新型双重抗侧力体系。为研究不同钢材对抗震性能的影响，在试验的基础上对5种K形组合偏心支撑钢框架的抗震性能进行非线性有限元分析。对有限元模型进行分析时仅改变钢材的强度等级，构件截面和边界约束条件与试验则完全一致，同时考率几何非线性和材料非线性。通过对各试件耗能机理、应力分布以及塑性铰力学模型的分析表明，在耗能梁段相同的条件下，适当提高框架钢材强度等级可以抵抗耗能梁段应变硬化产生的内力增大效应，从而避免因增大截面导致的用钢量上升；此时结构的延性虽有所下降，但刚度退化速率减缓，钢框架残余变形小，有利于震后修复。［关键词］耗能梁段; 应变硬化; 内力增大系数; 能量耗散中图分类号：TU393.2 文献标识码：A 文章编号：1002-848X(2016)07-0086-07
Nonlinear finite element analysis on seismic behavior of high strength steel composite K-typed eccentrically braced steel framesDuan Liusheng1, Su Mingzhou2, Fang Zhenggang3, Wang Zhe4(1 School of Civil Engineering, Chang'an University, Xi'an 710061, China; 2 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; 3 China Electric Power Research Institute, Beijing 100055, China; 4 China Institute of Building Standard Design & Research Co. , Ltd., Beijing 100048, China)Abstract: High strength steel composite K-typed eccentrically braced steel frame is a new dual lateral load resisting system that adopts low yield point steel in link beam and high strength steel in steel frame. In order to study influences of different grades steel on seismic behavior, 5 K-typed eccentrically braced steel frames were analyzed by nonlinear finite element methods based on experiments. Considering the geometry nonlinearity and material nonlinearity, only steel strength grade was changed in finite element model analysis and the member sections and boundary constraints were still same to the experiment specimens. The energy dissipation mechanism, stress distribution and plastic hinge mechanical model of components were studied. The results show that for the same link beam, developing frame steel strength grade properly can resist the internal force increment effect due to the strain hardening of the link beam, thus avoiding the increase of the steel amount due to the section enlargement. Although the ductility of the structure is decreased, the rate of rigidity degeneration slows and residual deformation of steel frame is small which is easy for seismic retrofitting.Keywords: link beam; strain hardening; internal force increment coefficient; energy dissipation
* “十二五”科技支撑计划课题（2013BAJ10B03-0）。作者简介：段留省，博士，工程师，Email:duanliusheng@126.com。
